In this video, we visualise data from a spreadsheet of doctors' practices and prescriptions adding two methods for filtering. We deal with the issue of combining the two separate filters as one has a knock-on effect on the other.
NB- the data is synthetic, it's just modelled on the real thing!
This video is on the long side. If you're more interested in the visualisation than the control/filtering stuff you can just watch the first 20-25 mins!